Which of the following is different from the remaining three ?

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Q: 7 (MPPSC/2009)

Which of the following is different from the remaining three ?

question_subject: 

Logic/Reasoning

question_exam: 

MPPSC

stats: 

0,40,11,2,3,6,40

keywords: 

{'magnetite': [0, 0, 1, 0], 'bauxite': [1, 1, 3, 2], 'haematite': [0, 0, 1, 0], 'limonite': [0, 0, 2, 1]}